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simplify-rtx.c (avoid_constant_pool_reference): Support offsetted addresses in the constant pool.

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2005-05-26  Paolo Bonzini  <bonzini@gnu.org>

	* simplify-rtx.c (avoid_constant_pool_reference): Support
	offsetted addresses in the constant pool.

From-SVN: r100198
This commit is contained in:
Paolo Bonzini 2005-05-26 08:15:31 +00:00 committed by Paolo Bonzini
parent 57a95bc48d
commit bdb8217782
2 changed files with 34 additions and 14 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-05-26 Paolo Bonzini <bonzini@gnu.org>
* simplify-rtx.c (avoid_constant_pool_reference): Support
offsetted addresses in the constant pool.
2005-05-26 Paolo Bonzini <bonzini@gnu.org> 2005-05-26 Paolo Bonzini <bonzini@gnu.org>
* df.h (DF_SUBREGS, df_local_def_available_p, df_insn_modified_p): New. * df.h (DF_SUBREGS, df_local_def_available_p, df_insn_modified_p): New.

43
gcc/simplify-rtx.c
View File

@ -145,6 +145,7 @@ avoid_constant_pool_reference (rtx x)
{ {
rtx c, tmp, addr; rtx c, tmp, addr;
enum machine_mode cmode; enum machine_mode cmode;
HOST_WIDE_INT offset = 0;
switch (GET_CODE (x)) switch (GET_CODE (x))
{ {
@ -173,26 +174,40 @@ avoid_constant_pool_reference (rtx x)
/* Call target hook to avoid the effects of -fpic etc.... */ /* Call target hook to avoid the effects of -fpic etc.... */
addr = targetm.delegitimize_address (addr); addr = targetm.delegitimize_address (addr);
/* Split the address into a base and integer offset. */
if (GET_CODE (addr) == CONST
&& GET_CODE (XEXP (addr, 0)) == PLUS
&& GET_CODE (XEXP (XEXP (addr, 0), 1)) == CONST_INT)
{
offset = INTVAL (XEXP (XEXP (addr, 0), 1));
addr = XEXP (XEXP (addr, 0), 0);
}
if (GET_CODE (addr) == LO_SUM) if (GET_CODE (addr) == LO_SUM)
addr = XEXP (addr, 1); addr = XEXP (addr, 1);
if (GET_CODE (addr) != SYMBOL_REF /* If this is a constant pool reference, we can turn it into its
|| ! CONSTANT_POOL_ADDRESS_P (addr)) constant and hope that simplifications happen. */
return x; if (GET_CODE (addr) == SYMBOL_REF
&& CONSTANT_POOL_ADDRESS_P (addr))
c = get_pool_constant (addr);
cmode = get_pool_mode (addr);
/* If we're accessing the constant in a different mode than it was
originally stored, attempt to fix that up via subreg simplifications.
If that fails we have no choice but to return the original memory. */
if (cmode != GET_MODE (x))
{ {
c = simplify_subreg (GET_MODE (x), c, cmode, 0); c = get_pool_constant (addr);
return c ? c : x; cmode = get_pool_mode (addr);
/* If we're accessing the constant in a different mode than it was
originally stored, attempt to fix that up via subreg simplifications.
If that fails we have no choice but to return the original memory. */
if (offset != 0 || cmode != GET_MODE (x))
{
rtx tem = simplify_subreg (GET_MODE (x), c, cmode, offset);
if (tem && CONSTANT_P (tem))
return tem;
}
else
return c;
} }
return c; return x;
} }
/* Make a unary operation by first seeing if it folds and otherwise making /* Make a unary operation by first seeing if it folds and otherwise making